Cestee



(No Model.)

R. H. TWEDDELL, J. PLATT & J..FIELDING.

HYDRAULIC VALVE.

N 317,423, Patented May 5. 1885. I

UNITED STATES PATENT ()FFICE.

RALPH HART TWVEDDELL, OF WESTMINSTER, COUNTY OF MIDDLESEX, AND

JAMES PLATT AND JOHN FIELDING, OF GLOUCESTER, COUNTY OF GLOU- JESTER, ENGLAND.

HYDRAULlC VALVE.

SPECIFICATION forming part of Letters Patent No. 317,428, dated May 5, 1885.

Application filed May 16, 1884. (No model.)

To all whom it may concern: vided with a cap, 0, having ports communicat- 50 Be it known that we, RALHI HART TWED- ing with the ports in the base A. These caps DELL, of Westminster, in the county of Midaresecurely bolted to the base A, and each is dlesex, and JAMES PLATT and JOHN FIELD- provided with a piston, D, operated by a lever,

scribed, and pointed out in the claims.

' tional View through one of the valves, showing ING, of Gloucester, in the county of Gloucester, and Kingdom of Great Britain, have invented l certain new and useful Improvements in Hyl draulic Valves, and we do hereby declare the 1 following to be a full, clear, and exact descrip- 2 tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to an improvement in hydraulic valves, the object of the same being, first, to provide a simple, cheap, and efticient device for regulating the supply and exhaust to and from hydraulic machinery. A further object is to provide a series of valves situated side by side, the levers of two of said 5 valves being so connected to a looking or regulating device whereby one of said levers and its connected piston are locked against movement and retained in said locked position until the adjacent valve has beenlmovedzfrom one position to another, as will be hereinafter more fully described; and with these ends in view our invention consists in the parts and combinations of parts, as will be more fully do- In the accompanying drawings, Figure l is a view in elevation of a series of the valves. 1 Fig. 2 is a plan of Fig. l; and Fig. 3 is a seethe three levers and intermediate locking-plate in elevation.

A represents an elongated base, provided at opposite ends, and at its sides, if necessary, with the flanges a, by means of which it is -se- 5 cured to a suitable machine-frame-such, for instance, as a hanging-machine. This base in the present instance is provided, preferably on the same side, with three ports, I) b I)", communicatin g, respectively, with three independ ent cylinders, and, preferably on the opposite side of said base, with an exhaust-port, c, and pressure-port, c, which communicates with all three valves. The exhaust-chambers B of the valves are preferably situated in the longitudinal center of the base, and each valve is pro- E. These pistons are packed with U-sha-ped leather packing-rings cl, one of which moves 5 5 with each piston, while the other two are rigidly secured within the valve-casing. The upper ends of the pistons I pass through the outer ends of the caps O, and each is provided I with a slot, 0, in which the inner ends of the levers E rest and move.

These levers are pivoted to their respective caps O, and are operated by hand, as will be hereinafter described. The pistons D slide longitudinally in the easing formed by the caps and base, and are 6 5 adapted to open communication between the pressure-supply through the port 0, with the machine through the port I), and between the machine through the port I) with the exhaustchamber B.

The valve'casing is provided with the metallic rings G, designed particularly for protecting the U-shaped leather packing-ring d on the piston D, while the said piston is provided with a metallic ring, G, for the purpose of pro- 7 5 tecting the lower leather packing-ring of the case when the piston is moved so as to expose the said ring to the action of the compressed water. Each piston is provided about midway its length with a peripheral cut-away 8o portion, H, in which the metallic ring G is situated. This piston can, if desired, be formed of three parts, the two end parts being connected together by a double-ended screw, the central or exposed portion of whichr be smaller than the piston, to form apas: way for the water or the piston can be for. from a single piece of metal and cut awa; this point, as deemed most expedient. hen the valve or piston is in its central positiou 0 that is, when its lever is resting horizontally or at right angles to the valve-casing-the ports are all closed and the machine is cut off from the supply and exhaust. When the lever E is elevated and the valve depressed, the cut- 5 away portion H thereof comes opposite the port 0, and while the lower end of the said cutaway portion terminates in the chamber, and

allows the water to flow from the machine-cylinder out through the exhaust. It the valve be elevated, the communication between the machine and exhaustis cut off and communication between the pressure-supply and ma chine opened.

A series of valves arranged as described is particularly adapted for machines--such as flan gin g=n1achines wherein three plungers are employed, one plunger being used for holding the plate to be flanged solidly against the anvil, another plunger for bending the edge of the plate, and the third plunger, which operates at right angles to the other two, being for the purpose of forcing the said bent edge up in close contact with the anvil.

In amachine constructed as above described it is necessary that the second plunger should descend and bend the metal plate, and then ascend before the third or finishing plunger makes its stroke, so as to be out of the way of the said latter plunger. To accomplish this end, and to prevent accident or injury to the plungers, it is necessary to provide means whereby the third or finishing plunger cannot be operated until the second or bending plunger has been elevated.

which latter is pivotally secured to the valvecasing, and occupiesa position between the levers which control the movements of two of the valves. The lever B, which controls the movement of the holdingdown plunger, can

be moved at any time without danger of injuring the machine, and hence need not be grooves f, formed in the arc of a circle, and 1 with the angular grooves f f connected, respectively,with the curved grooves f on opposite sides. The levers E E are provided on their inner or adjacent sides with the laterallyprojecting lugs g, which latter move in the grooves formed in the plate I. By the construction and relative arrangement of the levers, lugs, and plate I, it is impossible for both lugs of the levers to be in the curved grooves at the same time, and hence when one is in the angular groove and the other in the curved groove the one in the angular groove will have to be moved before the other can be released. Now, for the sake of illustration, we will suppose'the levers E and E to be in the positions shown in Fig. 3, the former having its valve depressed, and consequently communication between the machine and exhaust open, and the other having its valve elevated and communication between the pressure-supply and the machine open. Thus it will be seen that it is impossible to elevate the valve connected to the lever E, as the plate I is pre vented from moving until after the lever E is moved so as to bring its lug, which now occupies a position in the angular groove f, up into the curved groove on its side of the plate, This lever E is first moved upwardly, and its lug, being in contact with the side wall of the groove f moves the plate I out to a vertical position, or until the lug on the lever E" stands over the open end of the groove f hen this position is reached,, the lug on the lever 11 has passed out of the groove f and entered the curved groove in communication therewith. Now, by pressing down on the lever E its lug is forced into the groove f while the lug on the lever E2 is carried from over the groove 1'' and locked against accidental displacement. These movements of the two levers just described throw the depressed valve which was in communication with the exhaust into communication with the supply, and the elevated valve which was in communication with the supply into communication with the exhaust.

In machines of this character wherein hydraulic plungers are employed, small drawback cylinders are employed for elevating or drawing back the plunger when the supply is cut cit and the exhaust opened. This cylinder is constantly supplied with pressurewater through the pipe .I.

If desired, a single valve of this construc- 1 tion can be employed; or two valves the le- This is accom- 3 plished by means'oi' the oscillating plate I, l

vers of which are connected by a plate, I, can be used; and hence we would have it understood that we consider ourselves at liberty to make such changes and alterations as fairly fall within the spirit and scope of our invention.

We are aware that it is not broadly new to arrange a series of valves side by side and so connected that one valve cannot be operated until another valve has been shifted, and hence we make no broad claim thereto.

Having fully described our invention, what we claim as new, and desire to secure by Let ters Patent, is-

The combination, with two valves situated side by side, each valve being provided with an independent lever, of a locking-plate or other device situated between the levers, substantially as set forth.

2. The combination,with two valves situated side by side, and independent levers for operating the valves, each lever being provided with a laterally-projecting lug, of a vibrating locking-plate located between the levers, and provided on opposite faces with an inclined and curved groove, in which the lugs on the levers rest and move, substantially as anrl for the purpose set forth.

3. The combination, with a series of valves arranged side by side and provided with a common supply or pressure port, independent discharge-ports, one or more exhaust-chambers, an independent piston for each valve, and a hand-lever foreach piston, two of which are provided on their adjacent faces with a lug, of a vibrating locking-plate located between the levers having the lugs, and providedv on its opposite faces with inclined and curved grooves, in which the lugs rest and move, substantially as set forth.

In testimony whereof I have signed thisin g witnesses.

specification in the presence of two subscribspecification in the presence of two subscribing witnesses.

JAMES PLATT,

RALPH HART TWEDDELL.

JOHN FIELDING.

Witnesses to the signature of Ralph Hart' Tweddell: ,Witnesses to the signatures of James Flatt.

H. G. SCOTT, L and John Fielding:

WM. BAILEY.

In testimony whereof we have signed this J OHN A. POPE, H. CADENNE. 

